Q. In an ac circuit, the current is given by $i = 5\sin\left( 100\ t - \frac{\pi}{2} \right)$ and the ac potential is $V = 200\sin{(100)}volt.$ Then the power consumption is
A) 20 $watts$
B) 40 $watts$
C) 1000 $watts$
D) 0 $watt$
Explanation
(d) $P = Vi\cos\phi$
Phase difference $\phi = \frac{\pi}{2} \Rightarrow P =$ zero
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.